Cidrize

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- Added LICENSE.rst (BSD 3-clause)
- Updated requirement to netaddr>=0.7.6
- Removed download_url from setup.py
- Other housekeeping within setup.py

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- IPv6 addresses are now supported!
- Enhanced dump output to display IP version
- Cleaned up formatting in README.rst
- All debug printing replaced with logging module (hint: set environment
variable DEBUG=1)
- Bugfix to bracket-style in which patterns with brackets not in 4th octet were
sometimes matching.
- Bugfix when returning strict results on parse styles that return IPRange
objects (bracket, hyphen styles). If an IPRange is larger than the hard-coded
limit of a /18, then it will always be strict.
- All changes covered by tests.

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- Optimization to range style parsing to improve speed on parsing large ranges
(such as /8).

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- Add ValueError to exceptions caught in cidrize() for wrapping with CidrizeError
- removed `ip = IPAddress` assignment when 'ip' was only used twice. unnecessary.
- Grammer ficks to docstrings
- Remove copyright

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- Add ValueError to exceptions caught in cidrize() for wrapping with CidrizeError

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- Collapsed bracket parsing RE into same pattern
- More descriptive var name in parse_commas()